Update README.md

Added SQLZOO to the Databases section. It has more exercises to go through.
uranusman · Dec 24, 2013 · a346ceb · a346ceb
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@@ -60,6 +60,7 @@ Start here.
 
 * **Databases**
  * SQL Tutorial [W3Schools / Tutorials](http://www.w3schools.com/sql/)
+ * Another SQL Tutorial [SQLZOO](http://sqlzoo.net/wiki/Main_Page)
  * Introduction to Databases [Stanford / Online Course](http://class2go.stanford.edu/db/Winter2013/)
 
 * **Data Mining**